Amazon.com : Honritone 4 Inch Nylon Mesh Filter Socks Bag 50 Micron by 14 Inch Long Aquarium Sump Water Filter Bags 3 Pack (50 Micron/um) : Pet Supplies
50 micron filter bag - Freddy
PARKER, Felt, Welded, Filter Bag - 4NVF1|G2PE50-Q - Grainger
3" Reusable 50 Micron In-line Filter Bag | Mann Lake Ltd.
Pentair - 50 Micron, Size 2, 200 GPM Max Flow, High Flow Bag Filter - 71775910 - MSC Industrial Supply